an inflammatory bowel disease that causes ulcers and irritation in the inner lining of the colon and rectum.
A disease of the large bowel, characterised by ulceration of the lining of the bowel, bleeding, abscess formation; the pathological appearances are usually characteristic and the cause is unknown.
a disease that causes inflammation and sores, called ulcers, in the superficial layers of the lining of the large intestine. The inflammation usually occurs in the rectum and lower part of the colon, but it may affect the entire colon. Ulcerative colitis rarely affects the small intestine except for the lower section, called the ileum.